diff --git a/drivers/pnp/resource.c b/drivers/pnp/resource.c
index d95e101..bacddd1 100644
--- a/drivers/pnp/resource.c
+++ b/drivers/pnp/resource.c
@@ -31,7 +31,7 @@
  * option registration
  */
 
-struct pnp_option *pnp_build_option(struct pnp_dev *dev, unsigned long type,
+static struct pnp_option *pnp_build_option(struct pnp_dev *dev, unsigned long type,
 				    unsigned int option_flags)
 {
 	struct pnp_option *option;